# US 2019/0319306 A1 · Diester-based polymer electrolytes for high voltage lithium ion batteries

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- Number: US 2019/0319306 A1
- Document ID: US20190319306A1
- Status: Published application
- Kind: A1
- Application number: 16/445,131
- Filed: 2019-06-18
- Published: 2019-10-17
- Earliest claimed: 2017-04-07
- Assignees: Seeo, Inc.
- Applicants: Seeo, Inc.
- Inventors: Malar Azagarsamy; Hany Basam Eitouni; Kulandaivelu Sivanandan
- Web page: https://patentgrep.com/patent/US20190319306A1

## CPC

- H01M 10/0565: Polymeric materials, e.g. gel-type or solid-type
- C08G 63/00: Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule (polyester-amides C08G69/44; polyester-imides C08G73/16)
- C08G 63/02: Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds
- C08G 63/16: Dicarboxylic acids and dihydroxy compounds
- C08G 63/6856: {Dicarboxylic acids and dihydroxy compounds}
- C08G 64/02: Aliphatic polycarbonates
- H01M 4/13: Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M 10/056: characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 2300/0068: inorganic
- H01M 2300/0082: Organic polymers
- H01M 2300/0091: in the form of mixtures
- Y02E 60/10: Energy storage using batteries
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

New homopolymers and copolymers of diester-based polymers have been synthesized. When these polymers are combined with electrolyte salts, such polymer electrolytes have shown excellent electrochemical oxidation stability in lithium battery cells. Their stability along with their excellent ionic conductivities make them especially suitable as electrolytes in high energy density lithium battery cells.

## Claims

### Claim 1

A copolymer, comprising:
a first polymer comprising a diester-based polymer comprising:
wherein b is an integer that ranges from 4 to 6; and
n is an integer that ranges from 1 to 1000; and
a second polymer selected from the group consisting of polystyrene, hydrogenated polystyrene, polymethacrylate, poly(methyl methacrylate), polyvinylpyridine, polyvinylcyclohexane, polyimide, polyamide, polypropylene, polyolefins, poly(t-butyl vinyl ether), poly(cyclohexyl methacrylate), poly(cyclohexyl vinyl ether), poly(t-butyl vinyl ether), polyethylene, poly(phenylene oxide), poly(2,6-dimethyl-1,4-phenylene oxide), poly(phenylene sulfide), poly(phenylene sulfide sulfone), poly(phenylene sulfide ketone), poly(phenylene sulfide amide), polysulfone, polyvinylidene fluoride, and combinations thereof.

### Claim 2 (depends on 1)

The copolymer of claim 1 further comprising an electrolyte salt, wherein the copolymer is an electrolyte.

### Claim 3 (depends on 1)

The copolymer of claim 1 wherein the copolymer is crosslinked.

### Claim 4 (depends on 3)

The copolymer of claim 3 further comprising an electrolyte salt, wherein the copolymer is an electrolyte.

### Claim 5 (depends on 1)

The copolymer of claim 1 wherein the copolymer is a block copolymer comprising a first block comprising the first polymer and a second block comprising the second polymer.

### Claim 6 (depends on 5)

The copolymer of claim 5 further comprising an electrolyte salt, wherein the copolymer is an electrolyte.

### Claim 7 (depends on 2)

A positive electrode comprising:
a positive electrode active material; and
a catholyte comprising the electrolyte according to claim 2;
wherein the positive electrode active material particles and the catholyte are mixed together.

### Claim 8 (depends on 7)

The positive electrode of claim 7 wherein the catholyte further comprises a solid polymer electrolyte.

### Claim 9 (depends on 7)

The positive electrode of claim 7 wherein the catholyte further comprises ceramic electrolyte particles.

### Claim 10 (depends on 7)

The positive electrode of claim 7 wherein the catholyte is crosslinked.

### Claim 11 (depends on 7)

The positive electrode of claim 7 wherein the positive electrode active material is selected from the group consisting of lithium iron phosphate, lithium metal phosphate, divanadium pentoxide, lithium nickel cobalt aluminum oxide, lithium nickel cobalt manganese oxide, magnesium-rich lithium nickel cobalt manganese oxide, lithium manganese spinel, lithium nickel manganese spinel, and combinations thereof.

### Claim 12 (depends on 7)

The positive electrode of claim 7 wherein the electrolyte salt is a lithium salt.

### Claim 13 (depends on 2)

An electrochemical cell, comprising:
an anode configured to absorb and release lithium ions;
a cathode comprising cathode active material particles, an electronically-conductive additive, and a first catholyte;
a current collector adjacent to an outside surface of the cathode; and
a separator region between the anode and the cathode, the separator region comprising a separator electrolyte configured to facilitate movement of lithium ions back and forth between the anode and the cathode;
wherein the first catholyte comprises the electrolyte according to claim 2, and the electrolyte salt is a lithium salt.

### Claim 14 (depends on 13)

The electrochemical cell of claim 13 wherein the first catholyte further comprises a solid polymer electrolyte.

### Claim 15 (depends on 13)

The electrochemical cell of claim 13 wherein the first catholyte and the separator electrolyte are the same.

### Claim 16 (depends on 13)

The electrochemical cell of claim 13 wherein the separator electrolyte comprises a solid polymer electrolyte.

### Claim 17 (depends on 2, 13)

The electrochemical cell of claim 13 further comprising an overlayer between the cathode and the separator region, the overlayer comprising a second catholyte, the second catholyte comprising the electrolyte according to claim 2.

### Claim 18 (depends on 17)

The electrochemical cell of claim 17 wherein the first catholyte and the second catholyte are the same.

### Claim 19 (depends on 13)

The electrochemical cell of claim 13 wherein the anode comprises a material selected from the group consisting of lithium metal, lithium alloy, lithium titanate, graphite and silicon.

### Claim 20 (depends on 13)

The electrochemical cell of claim 13 wherein the first catholyte is crosslinked.